William cook



(Mdel.)

W. COOK.

SCALE MEASURE. y No. 405,464. Patented June 18, 1889.

2 N, QJ

A TTOR/l/Ey in which provision is made for adjusting them l UNITEDSTATES lPATENT OFFICE.

VILLIAM COOK, OF NEW YORK, N. Y.

SCALE=M EASU RE.

SPECIFICATION forming part of Letters Patent No. 405,464, dated .I une18, 188%9.

Application tiled May 4, 1888. Serial No. 272,772. (Model.)

To all whom t may concern.-

Be it known that I, VILLIAM COOK, of the city, county, and State of NewYork, have inventedanew and Improved Convertible Rule, of which thefollowing` is a Jfull, clear, and exact description. i

The invention relates to that class of rules for use as a square or abevel; and the object of the invention is to improve the construction ofthe adjusting devices with a view of Simplifying their operation andminimizing the cost of production.

The invention consists in a certain construction and combina-tion ofparts, as here inafter described and claimed.

Reference is to he had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the iigures.

Figure l is a broken plan view representing the rule adjusted as asquare. Fig. 2 is a like view representing the rule adjusted as a bevelfor obtaining a miter-line; and Figs. 3 and 4 are sectional views on thelines :r m and y y, respectively. Fig. 5 is a perspective view of thenotched or slotted face-pieces of the rule and the locking slideseparated.

The two graduated arms or members A B of the rule are connected by theordinary form of joint C. The novel feature consists in constructing oneof the brasses or brass face-pieces b, which are applied at the saidjoint, with two notches or slots CZ in its curved convex edge, and theother or opposite facepiece a with one notch or slot d in its concaveedge, and in arranging in the said slot d a slide D, which may beadjusted or projected so as to enter either of the two notches d inface-piece h for the purpose of locking the arms A B of the rule at anangle of ninety degrees, as shown in Fig. l, or forty-five degrees, asshown in Fig. 2. NVhen the armsA B are thus locked, the rule may be usedas a try-square or a miter-square. The sides of the slot cl', in whichthe slide D is fitted, are undercut, as shown in Fig. 4, in oi'der tohold said slide in place. The latter is provided with a stud d2, whichprojects from its face, and serves as a thumb-piece for adjusting theslide. Said stud enters a hole cl3 in the rulearin A when the rule is'folded.

It will be seen that the slide is held by the faceplate a alone, and isadapted to engage either notch in the other plate h. Thus I attain aneconomy in manufact-ure of the rule as compared with others ot' itsspecial class. There is also an advantage in the arrangement of theparts, since they are in view of the user of the rule, thus promotingconvenience in manipulating it. Besides this, the rule-joint is notweakened by this manner of applying the slide.

Vh-at l claim is- The combination, with the rule-arms A B, of the jointfacefpieces a h, provided with notches'in their contiguous curved edges,as speciiied, and the slide D, arranged in the notch of facepiece a,said notch having undercut sides for the purpose of retaining the slidetherein, as shown and described.

WILLIAM COOK. lVitnesses:

C. SEDGWICK, W. S. WALKER.

